31897270990 has 32 divisors (see below), whose sum is σ = 61909414560. Its totient is φ = 11762638464.

The previous prime is 31897270943. The next prime is 31897271053. The reversal of 31897270990 is 9907279813.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50320 + ... + 257539.

It is an arithmetic number, because the mean of its divisors is an integer number (1934669205).

Almost surely, 2^31897270990 is an apocalyptic number.

31897270990 is a deficient number, since it is larger than the sum of its proper divisors (30012143570).

31897270990 is a wasteful number, since it uses less digits than its factorization.

31897270990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308676.

The product of its (nonzero) digits is 1714608, while the sum is 55.

The spelling of 31897270990 in words is "thirty-one billion, eight hundred ninety-seven million, two hundred seventy thousand, nine hundred ninety".